Table 1.
Test-retest reliability analysis (two-way mixed effects, absolute agreement) and Bland-Altman results
Variable
ICC3,1
95%CI
Sig
SEM
Bias
Relative bias (%)
Lower LOA
Upper LOA
Overall mean force (N)
0.91
[0.85-0.95]
0.00
7.81
9.71 (10.68)
6.66
-11.23
30.64
Max Force (N)
0.93
[0.88-0.96]
0.00
7.93
3.98 (11.15)
2.25
-17.87
25.83
Mean peak force (N)
0.92
[0.86-0.96]
0.00
8.31
9.18 (11.40)
5.83
-13.16
31.51
Inter-stroke range (N)
0.85
[0.74-0.91]
0.00
4.47
-0.13 (6.37)
0.60
-12.62
12.36
Mean stroke duration (s)
0.38
[0.10-0.60]
0.01
0.03
2.85x10
-3
(0.04)
0.06
-0.09
0.08
Stroke duration variability (s)
0.44
[0.18-0.65]
0.00
0.05
-0.02 (0.07)
18.17
-0.16
0.12
Total number of strokes
0.46
[0.20-0.66]
0.00
1.31
-0.19 (1.84)
1.03
-3.79
3.42
Total impulse (Ns)
0.88
[0.79-0.93]
0.00
85.75
74.76 (121.84)
5.41
-164.04
313.56
Endurance index (%)
0.74
[0.58-0.85]
0.00
0.06
0.03 (0.08)
3.57
-0.12
0.19
Time to first peak (s)
0.41
[0.14-0.62]
0.01
0.12
0.03 (0.17)
5.31
-0.29
0.36
Rate of force development (N/s)
0.25
[0.00-0.50]
0.08
1335.5
532.8 (1895.7)
32.84
-3182.9
4248.5
ICC = intra-class correlation, CI = confidence interval, Sig=significance level, SEM = standard error of measurement, LOA = limit of agreement, N = Newtons, s = seconds